It is not either/or proposition: either we preach personal redemption for the salvation of souls or we seek to establish justice in the gate. We can and we should seek to do both. If we love our neighbors, as God calls us to do, then of course we will want to see them treated fairly under the law, not taken advantage of, robbed, or killed. If we love them, we will want to see them both come to know the Lord for their eternal salvation and to enjoy the blessings of freedom, peace, and prosperity under the rule of law.
We want no part of either a false pietism that avoids addressing worldly concerns or a false “social gospel” that only address worldly concerns. It’s possible to err in either direction. Let’s err in neither. God shows himself to be deeply interested in people’s well-being in this life as well as in the next. We should be deeply interested in both, also.